package android_serialport_api;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.util.EncodingUtil;

public class SerialPort {
	private FileDescriptor mFd;
	private FileInputStream mFileInputStream;
	private FileOutputStream mFileOutputStream;

	public SerialPort(int baudrate, int flags) throws SecurityException,
			IOException {
		//"/dev/ttyMT2"
		File device;
		String fileStr = "/dev/ttyMSM0";
		if (EncodingUtil.getSystemType() != 0) {
			fileStr = "/dev/ttyHSL1";
		}
		device = new File(fileStr);
		/* Check access permission */
		if (!device.canRead() || !device.canWrite()) {
			try {
				/* Missing read/write permission, trying to chmod the file */
				Process su;
				su = Runtime.getRuntime().exec("/system/xbin/su");
				String cmd = "chmod 777 " + device.getAbsolutePath() + "\n"
						+ "exit\n";
				su.getOutputStream().write(cmd.getBytes());
				if ((su.waitFor() != 0) || !device.canRead()
						|| !device.canWrite()) {
					throw new SecurityException();
				}
			} catch (Exception e) {
				e.printStackTrace();
				throw new SecurityException();
			}
		}
		mFd = open(device.getAbsolutePath(),baudrate, flags);
		if (mFd == null) {
			throw new IOException("串口接口出现问题");
		}
		mFileInputStream = new FileInputStream(mFd);
		mFileOutputStream = new FileOutputStream(mFd);
	}

	// Getters and setters
	public InputStream getInputStream() {
		return mFileInputStream;
	}

	public OutputStream getOutputStream() {
		return mFileOutputStream;
	}

	// JNI
	private native static FileDescriptor open(String path, int baudrate,
											  int flags);

	public native void close();

	static {
		System.loadLibrary("serial_port");
	}

}
